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  <title>Gets the block size of the specified cipher</title>

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</div><hr /><div id="function.mcrypt-get-block-size" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">mcrypt_get_block_size</h1>
  <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mcrypt_get_block_size</span> &mdash; <span class="dc-title">Gets the block size of the specified cipher</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.mcrypt-get-block-size-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">int</span> <span class="methodname"><strong>mcrypt_get_block_size</strong></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$cipher</code></span>
   )</div>

  <div class="methodsynopsis dc-description">
   <span class="type">int</span> <span class="methodname"><strong>mcrypt_get_block_size</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$cipher</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$mode</code></span>
   )</div>

  <p class="para rdfs-comment">
   The first prototype is when linked against libmcrypt 2.2.x, the
   second when linked against libmcrypt 2.4.x or 2.5.x.
  </p>
  <p class="para">
   <span class="function"><strong>mcrypt_get_block_size()</strong></span> is used to get the
   size of a block of the specified <em><code class="parameter">cipher</code></em> (in
   combination with an encryption mode).
  </p>
  <p class="para">
   It is more useful to use the <span class="function"><a href="function.mcrypt-enc-get-block-size.html" class="function">mcrypt_enc_get_block_size()</a></span>
   function as this uses the resource returned by
   <span class="function"><a href="function.mcrypt-module-open.html" class="function">mcrypt_module_open()</a></span>.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.mcrypt-get-block-size-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">cipher</code></em></dt>

     <dd>

      <p class="para"><strong><code>MCRYPT_ciphername</code></strong> 常量中的一个，或者是字符串值的算法名称。</p>
     </dd>

    
    
     <dt>
<em><code class="parameter">mode</code></em></dt>

     <dd>

      <p class="para"><strong><code>MCRYPT_MODE_modename</code></strong> 常量中的一个，或以下字符串中的一个：&quot;ecb&quot;，&quot;cbc&quot;，&quot;cfb&quot;，&quot;ofb&quot;，&quot;nofb&quot; 和 &quot;stream&quot;。</p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.mcrypt-get-block-size-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Gets the block size, as an integer.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.mcrypt-get-block-size-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-818">
    <p><strong>Example #1 <span class="function"><strong>mcrypt_get_block_size()</strong></span> example</strong></p>
    <div class="example-contents"><p>
     This example shows how to use this function when linked against libmcrypt
     2.4.x and 2.5.x.
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">mcrypt_get_block_size</span><span style="color: #007700">(</span><span style="color: #DD0000">'tripledes'</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'ecb'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;8<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.mcrypt-get-block-size-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.mcrypt-get-key-size.html" class="function" rel="rdfs-seeAlso">mcrypt_get_key_size()</a> - Gets the key size of the specified cipher</span></li>
    <li class="member"><span class="function"><a href="function.mcrypt-enc-get-block-size.html" class="function" rel="rdfs-seeAlso">mcrypt_enc_get_block_size()</a> - Returns the blocksize of the opened algorithm</span></li>
    <li class="member"><span class="function"><a href="function.mcrypt-encrypt.html" class="function" rel="rdfs-seeAlso">mcrypt_encrypt()</a> - Encrypts plaintext with given parameters</span></li>
   </ul>
  </p>
 </div>


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